Oklahoma's size and weight limits are governed by both state and federal laws.

Federal law, specifically 23 U.S.C. 127, sets weight restrictions for interstate travel, including 20,000 pounds per single axle, 34,000 pounds per tandem axle, and a gross weight not to exceed 80,000 pounds, unless authorized by special permits or designated routes.

Oklahoma has additional size and weight limitations, which may also be set by local authorities for highways under their jurisdiction.

These limitations are communicated through posted signs on relevant highways.

Violating Oklahoma's size and weight limitations constitutes a misdemeanor offense.

Violations of size limitations incur fines ranging from $5 to $500, or imprisonment for up to ten days.

Repeat violations within a year of prior convictions may result in increased jail time, up to twenty days for a second offense, or up to six months for a third or subsequent offense, or both imprisonment and a fine.

Knowingly or willfully violating weight limitations, whether imposed by law or permit, also constitutes a misdemeanor offense.

Upon conviction, such misdemeanor offenses are punishable by fines of up to $1,000.

Violators are considered in contempt of the Corporation Commission and may face fines of up to $500.

Violation of terms specified in a special permit by exceeding the authorized permit weight incurs a penalty of $100, along with additional fines outlined in a predetermined schedule.